这台空气循环器能均匀地将暖风送至房间每个角落。

The air ___circulator helps distribute warm air evenly throughout the room.

这台水泵作为循环器，使冷却液在发动机中不断流动。

This pump works as a ___circulator to keep the coolant moving through the engine.

办公室里的消息总是最先从他那里听说，他是个出了名的消息传播者。

Office news always reaches him first—he's a notorious ___circulator of rumors.